Finding the Fourth Proportional to 1,556.43, 2,147.91 and 857.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,556.43 : 2,147.91 = 857.82 : x
2. Step 2: Convert to fraction form
   1,556.43/2,147.91 = 857.82/x
3. Step 3: Cross multiply
   1,556.43x = 2,147.91 × 857.82
4. Step 4: Simplify right side
   1,556.43x = 1,842,520.16
5. Step 5: Solve for x
   x = 1,842,520.16/1,556.43
6. Step 6: Final answer
   x = 1,183.81